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Equipment Repairs => LCD TV forum => Topic started by: billy no mates on December 24, 2011,17:18:06

Title: LG Flatron M1721a-bz aekwlf
Post by: billy no mates on December 24, 2011,17:18:06

hi
ive been asked by a friend to repair this tv/monitor

powers on then shuts down after about a minute

just had it open and three caps on secondry side of psu bulged so obviously knackered
but gonna get these tomorrow from maplins + a couple of others

what im after is a service/training manual for the above model just in case there are any other faults after caps been changed


hope someone can help

cheers
billy :)

Title: Re: LG Flatron M1721a-bz aekwlf
Post by: dougc on December 24, 2011,20:13:25

Just change caps 80/90% certain to cure. Make sure you use 105 degree ones. Cheers, Doug.

Title: Re: LG Flatron M1721a-bz aekwlf
Post by: billy no mates on December 25, 2011,11:54:37

cheers doug :)

Title: Re: LG Flatron M1721a-bz aekwlf
Post by: billy no mates on December 31, 2011,18:44:17

Hi
 doug and everyone else
 well ive changed caps still no change powers on for a few seconds then backlight goes off and the bloody thing shuts down

model no:- see above
                                 
                                 BLUE BIRD 2(17A) 68709M005L
it has a chassis no of : CL-81 060721 C.S

any help greatly appreciated

thanks
billy

Title: Re: LG Flatron M1721a-bz aekwlf
Post by: michael first on January 02, 2012,04:13:03

Hi,a happy N/Y to all,now you should check up the smd MOSFETS on the IP board if everything OK try to override the controller IC's protections.

Title: Re: LG Flatron M1721a-bz aekwlf
Post by: billy no mates on January 02, 2012,11:52:06

hi michael thanks for the reply,will check tomorrow having a lazy day today lol...a little hungover i dont suppose you know where i could find a service manual for this chassis at all


regards
billy  :c017:

Title: Re: LG Flatron M1721a-bz aekwlf
Post by: billy no mates on January 05, 2012,12:22:37

hi all

mosfets tested ok and i found a service manual but i cant find the protection circuit in the manual i have so im stuck now  :41:

any other suggestions

regards billy

Title: Re: LG Flatron M1721a-bz aekwlf
Post by: Turnip on January 06, 2012,12:32:27

Hi BNM,

Where's this manual on Quuq ?  - Keen Folks will doubtless check your problem and come up with solutions of some sort - Chris

Title: Re: LG Flatron M1721a-bz aekwlf
Post by: billy no mates on January 06, 2012,12:54:47

hi sorry chris didnt find it on here but i will upload it now

Title: Re: LG Flatron M1721a-bz aekwlf
Post by: michael first on January 07, 2012,04:19:02

Hi Billy,can you tell me what kind of ic is mounted on the inverter board,as the service manual doesn't list it.

Title: Re: LG Flatron M1721a-bz aekwlf
Post by: billy no mates on January 07, 2012,06:23:56

hi michael

the inverter board and power supply is all in one
there are three surface mount ics on the back of the board

2x 8 pin ics = nikos  p210nvc
and 1x 20 pin ic = OZL68GN

regards
billy

Title: Re: LG Flatron M1721a-bz aekwlf
Post by: billy no mates on January 08, 2012,07:25:53

morning all

has anyone had any ideas of a mod i could try as when first switch on it has a slight pink tint so i suspect a ccfl going bad and making the sensing circuit kick in

regards
billy

Title: Re: LG Flatron M1721a-bz aekwlf
Post by: billy no mates on January 08, 2012,11:19:04

hi guys

just tried again and noticed when it reverts back to stanbdy i have a slight buzzing noise from speakers and when unpluged from mains i get a popping noise from them also

i dont know if this helps point to anything that may be going or has gone bad on power supply ?

regards
billy

Title: Re: LG Flatron M1721a-bz aekwlf
Post by: michael first on January 09, 2012,06:52:33

hi,unfortunately there are not datasheets for OZL68.sorry

Title: Re: LG Flatron M1721a-bz aekwlf
Post by: billy no mates on January 12, 2012,15:04:06

hi micheal

thanks for the reply


think im goning to tell him to skip it

regards billy